Grinding-machine.



W. C. STEPHENSON 6L A. 1. DRAPALIK.

GRINDING MACHINE.

APPLICATION FILED JAIIZZ. 1915.

Jatnted Oct. l2, 1915.

VVIII W. C. STEPHENSGN L A. i. DRAPALIK.

GRINDING MACHINE.

APPLICATION FILED JAILZZ. i915.

LR Patented 06h12, 1915.

4 SHEETSmSHEET 2.

dfi

w. C. STEPHENSON L A. 1. DRAPAUK.

GRINDING MACHINE.

APPLlCATlON FILED JAN.22, i915.

4 SHEEI'S'A'SHEEI 3.

lillilallj and an automatic reversing gear Jfor reversflilllgidfalllilld WLLIM CURRY STEPHENSON AND ALFRED J. DRMALIK OF EWCKYMOUNT, NORTH CROLIN, ASSIGNQRS OF ONE-HALF T0 CHARLES lvl'. NEWMN, 0:5ROCKY MOUNT,

NORTH CAROLIN.`

Specification of Letters retest..

Patented @ein i2, i915.

To all ilwm t1/nay concern.:

Be it known that we, VILLIAM C. S'rn-r rnfnneon and ALFRED J. Denman,residing at .Rocky Mount, in the county of. Edgeeombe and State of NorthCarolina, have invented certain new and useful Improvements inGrinding-Machines, of which the following is a specification. V

This invention relates to machines for intermal, external, and surfacegrinding, and it is especially designed for u in air brake repair Work,such as the grinding of triple valve bushings, air 'pump governorcylinders, brake `valve rotories and seats, and the left hand main steamvalve head for livestinghonse air umps.

It is one ofthe principal objects of the present invention to provide :imachine in which the above Work can be accurately, effectively andinexpensively accomplished, and to provide a machine which isself-contained, capable of allnecessary adjustments, having provisionytor taking up wear of parts, and also provided with mechanism wherebythe Vrinding tool may be antornatically fed )ack and forth with relationto the work.

i Generirally, the invention comprises a bed` and support on which-1s(preferably) an adjustable spindle. carriage that has provision forreceiving the chuck spindle, grinding tool carriage that is movablealong the hed to and from the chuck by hand or hyl automatic mechanism.the automatic mechanism being controlled h v hand so as to be throwninto and out of action, as desired.

in;r the direction of movement of the grind- `ing tool carriage when itreaches the ends of its path of reeiprfu'atory travel.

More suhorduiately, the Vinvention 1neludes prov1s1ons for adjusting thedislance through which the. carriage is moved hack and forth, theprovision oi' means lor adjusting the position of the spindle carriageand ot' the tool carriage to allow 'for grinding tapers. means tortakingup wear in the grinding tool spindle hearings, provision of means forcollecting and ejecting the grindings from the work and provision ofmeans lor dressing the grinding tool.

Again, the invention includes 'those novel l details of construction,combination and arrangement ot' parte, all of which. will be first fullydescribed, then speciiicaily point ed out in the appended claims, andillustrated in the accompanying drawings, in wh1ch:-

Figure l is a perspective view of a grinding machine embodying theinvention. Fig. 2 is an enlarged cross section of a part of the machinetaken on the line 2-2 of Fig. l. Fig. 3 is aside elevation and partvertical section of a portion oi the machine showing the working parts.l is a side elevation of a part of the machine. Fig. 5 is a crosssection on the line 5 5 of ig. 4. Figz is a cross section on the line(5l-tl on Fig. 4. Fig. 7 is a detail perspective View of the partscomprising the reversing gear.

8 is a perspective View of a portion of a detail perspective of theshiitable clutch sleeve. Fig. 12 is an elevation 'of the clutch, beltpulley and a portion of the reversing gear for the tool carriage feed.Fig. 13 is a detail top plan view of the saine. 14- is a detail .planand section showing a latch for holding,r the clutch in its inl7 and outposition, the view being a section on the line 14e-14 on' Fig. 1. Fig.15 is a detail vertical section'o'f the chuck spindle showing-theadjustable take-up bearings. Fig. 16 is a detail vertical cross sectionon the line 1(5--10 of livin'. .:ieivl of the grinder tool holdershowing how it, ma)v he adjusted for gnding tapers, etc. Fig. 1S is adetail cross section illustrating the construction of the/'dust orgrinding ejector. Fig'. 19 is a detail cross section on the line 19-19of the same. Fig'. 20 is adetail cross Section on the line 2O 2Q ofFig'. 1. Fig. 21 is a detail vertical sectionon the line Ell-21 on Fig.17. Fig. 29; is a detail side elevation, parts being broken' awayillustrating the mannerof using the grinding tool dressing implement.

Fig. 17 is a detail plan In the drawings, in which like letters and lto.

and 2 is the chuck spindle carriage which is Asecured tothe bed by bolts4 5. The spindle carriage 3 has bearing stand-i;l

ards G that carry the bearings 7 'for the spin die. The spindle `isconstructed` as best shown in Fig. 15, by reference to which it will beseen'that the front or projecting end is threaded atb, to receive thechuck 28 andl provided with a collar 9 that abuts the bea-ry to receivethe driving pulley 16, which pulley is secured toA the spindle in anydesi-red way, as for instance by set screws, as shown in Fig. l5. vThespindle is also threaded et 17 to receive the adjusting and iam -nuts18-19, which engage the bearing bushing 22, the bushing 22 being boredconically in a reverse way to the bushing 11, so as to receive theconical sleeve 21 that is keyed on the spindle section 20 and is heldadjustably between the jam nuts 18-19, and the jam nuts 23--24.

25 is the rearwardly projecting end. of the spindle on which the' doublebelt pulley 27 is keyed, as at 26. s

29 is a worm shaft which is mounted in bearings on therear of thestandard 2. rThe shaft 29 carries ay pair of loose belt pulleys ft2-33respectively around which the endless belts 31 take, the belts 31passing also around the pulley 27, one of the belts 31 being crossed, asshown., to effect a reverse drive. Each pulley 3233 has a clutch face tocoperate with the shifting clutch element 34 that is designedto beshifted by a slider 235, which is forked to the shifting clutch element34, (see Fig. 13) and isslidable on a guide projecting from theside ofthe standard 2. ',l`he 'slider is moved by a lever 36, that is fulcrumedat 37 on a bracket 3S, and is operated by the automatic shiftingmechanism shown best in Fig. 7 and hereinafter again referred to. Theworm 39 meshes with the worm gear 40 (see` Figs. 2 and 8) and theworni'gear 40 has a hollow hub 4l? which is mounted in a bearing 42 inthe standard 2 and shouldered to abut the bearing, the gear 40 beingheld in place in the bearing by the 'shoulder 41?L and by a disk 47,which is secured at 48 to the hub 41.

43' is a shiiitable clutch sleeve that is keyed to the hollow shaft 44which carries the bevel pinion (l1 hereinafter again referred Theshittable clutch sleeve 43 has a clutch face 45 to engage the 'clutchface 4G ot the disk 47 when the parts are brought together and thesleeve 43 is shoved in Lthe huh 41 by a rod 4!) which is mounted in the'f hollow shaft 44 and forms a bearing for the pivoted at `on the toolshaft 74.

intensos same, the rod 49 projecting, also,-jthrough a bea-ring 52 inthe front wall of the standard 2 and beingl pin-connected at 53 to ahand lever 54, which is bifurcatedat 55 and y 56 to a bracket extendingfrom .7'9 the standard 2. The other end 'of the rod 49 has a collar 50and passes through the closed end of thet'ubular clutch sleeve 43 where4itt-has a swivel bearin with respect to the clutch' sleevesgthe rodeing held from 75 reciproca-tion with. Arelation to the clutch. sleeveby the 'collar 50 and jam nuts 51. They lever-'54 is held in either ofits two positions t (in7 or out) byA any4 suitable latch device. Oneform of latch device adapted for 30 this purpose is shown'in Fig. 14, byreference to which it will be seen that Athe lever 54 may beprovidedwith a projection 60 to engage oneof apair of' notches/58 in alatch 57 that may be spring pressed at 59 into 85 engagement with theleve r}54.

62 is a bevel pinion which is keyed on a shaft 63 that is provided witha double square thread 65 to engage the projecting lug 67 of the toolslide or oarriageS andy() move it in a longitudinal direction along thebed 1. The gear 62 meshes with the gear 61. The shaft 63 is mounted inbearings 6h against longitudinal motion and there' is provided a. handle06, on the projecting endof the shaft 63by which the carriage 68 may bemoved along the bed by hand, if desired. The lug 67 projects through aslot 69 in the bed 1 and the carriage 68 has an upwardly projectingportion 71 that has a Adove-tail 100 Slide connection with a block 72which is adapted to be fed transversely by the usual screw and handlemechanism 77, the block 7 2 forming the support on which the grindin'gtool bearing block 99 is mounted. In 105 order that the block 99 may heturned through 120 or thereabout to allow for grinding tapers, the block99 is bolted to the block 72 by bolts 101 that pass through slots 100 inthe block 99.

rlhe carriage 68 has a projection that rides in a longitudinal groove109 (see Fig, 20) in the bed l and there is also provided a set screw103 for locking the bar 78 to the nger 102. In addition the carriage GSis provided with guides 104 ywhich overlap the edges of the bed, asvshownfat 108 and are vheld in position by bolts 105 that carrysupporting springs 106 and are provided with an attachment 107 by meansof which the'120 tension on the springs may be regulated. The block 99has bearings 73 in which the shaft 74 is rotatably mounted and betweenwhich the driving' pulley 76 for the tool shaft 74 is located. 125

75 is the ,rrindinlgT disk which is mounted The shaft 74 of the grindingtool is provided with a bearing `11G7 which is split and receives theshall..

andhas a tapered exterior to fit into the nieuwe the bushing" U6 being'provided with a nut Il Ii i155 by means oi which wear may be taken.

up. rThe bearings 73 are provided with oiling holes l2() and arecliarnbered as at i12) to receive the ball bearings 'L21 for the shaftThe chamber 119 ot' the forward bearins,r is closed by an adjustableplus` 122 that is held by juni nut i225, while the chainber of thelatter bearing closed by plugs 12e-125. The puliey TG is held on theshaft ifi from turning., bya set screw 115.

a dust guard that is carried by the carriage (S8 to close the slot (SS)and prevent grindings from passing; down into the bed and interferingwith the proper operation of the interior mechanism.

The reversing gear, which is best shown in Fig'. TE comprises a slidebar 78 that is siotted at 79 at intervals and secured at 80 along theupper edge of the machine bed l for a limited longitudinal movement. Thesi' lo bar 27S provided with a pair oi, ad-

carried by the carri-122368, is movable. The siide bar 78 is pivoted toa inver tbc latter shci't being; nnnunted in a suitable bearing ir, thestandard 2 and aiso carrying a :gear segment 8e2 which meshes with apinion S5' ontlie reversing shaft 86. The shaft Si@ is 'mounted inbearings inthe standard and has an arm 87 rigidiy securedvto it andprojecting upwardly therefrom. The arm 8'! is provided with anadjustable weight 88 which, when the cent/er ot' gravity is 'passed willserve to turn the shaft 86 one Way or another, according to the side towhich the weight 88 falls.

F59 a crank which is carried by the shaft 86 and linked with the lever36.

91 is a handle niountedon the outer proiectingg' end o the` shaft 86 andby ineens ot which the reversing action. may be nianualiy obtained.

in order to adjust the spindle carriages 3 for purpose ot' tapergrinding" the saine may be provided 'with a pivoted projection 9bsecured at 97 to the carriage andreceiving the worin 95 ot theiuliusting shaft 93, that i1; mounted in bearings 92 in the bed of theinachindthe shaft 93 being provided with a mei-libel; 94, by means ofwhich it may be turned'. v

98 indicates a triple valve in place on the chuck and in position to begroun in the operation of grinding triple valves, the triple valve 98 isclampedl to the chuck 28, properly centered for operation, and thegrinding tool is adjusted with relation to the ivo-rk to efi'cct thegrinding operation.l

The lever 9i then -thrown over to shift the clutch element Si inengagement with one or the other of the pulioys 32--? which causes thecarriage v to be moved along the W between which the shifting that iscarried by a stub shaft 83,.

bed i. Assuming that the parts are the position shown in Fig. 3, thecarriagef ivili be movingy toward the work. Thestops 81 are so adjustedthat when the grinding tooi 75 has reached the liinit of its desiredmovement into the Work, the slide bar 78 will have been movedsuiiiciently to bring the weight 88 slightly past the dead cen'- teronto the other sidel of the same, Whereupon the weight 3S wiil cause thelever 87 to turn the shaft 86 to rapidly-disengage the clutch element 3ifrom the pulley 32 and shift it into engagement with the pulley therebyreversing' the direction of Inoveinent of the carriage 68. As soon asthe tool has been withdrawn the desired amount, the ingerlwill engagethe other stop 8l and shii't the bnr 78 in the opposite direction,thereby again shifting the clutch element 34 from the pulley 32 to thepulley and the tool 75 will be again fed to the work. This operation iscontinued indefinitely, it being' understood, ot' course, that theattendant proper. y adjusts tbetool 75 after it has moved in and out totake'up wear on the Work. Tiyhen it is desiredto grind ta.- peredsurfacei., the block 99 and carriage 3 are adjusted to bring; 4t-heno inthe proper correlative positions to effect Vthe desired grinding', aswill be clearly understood by those skilled in the art. A

The drawings illustrate a preferred embodiment of the invention and wed'o not wish to be understood as being conined to the specific detailsof construction further than are set out in the appendedcla'ims.

ln Fig. 22, we have -shown in detail the tool i552 and is Aaiso providedwith a handle, 131, by means of which the arm 126 can be swung up, asshown in dotted lines in Fig. 22, or loweredn esshown in full lines inthat figure, it beingunderstood that a suitable stop 129 is provided tohold the arm 126/in its inactive position.

F rom the foregoing description taken inv connection with theaccompanying `drawings, it is thought the complete construction,operation and advantages of our invention wiil be readily uinierstood bvthose skilled in the art.

What we claim is:

l. n a grindingmachine, a bed, a spindle vstock onthe bed, e chuckspindle mounted on. the stock, and means for turning said spindle;lagrinder tool' carriage. movable along the bed toward and from thechuck,

a grinder tool 'carriage movable along the.

bed toivard and fromthe chuck, means for rotating the tool; mechanismfor ed'ecting the movements of the tool carriage, means for driving saidmechanism from lsaid spindle, said driving means including a shiftahleclutch element, ioose clutch pulleys coperative with saidelement androtatable in opposite directions, and a reversing gear connection withsaid shitable clutch. element.

3. In a grinding machine, a bed, a. spindle stock on the bed, a chuckspindle mounted on the stock, means for turning said spindle; a grindertool carriage movable along the bed toward and from the chuck, means forrotating the tool; means for driving said mechanism from said spindle,said driving means including a `shiitable clutch element, loose clutchpulleys coperative with said element and rotatable in oppositedirections, and areversing gear connected with said shiftable clutchelement, said reversing gear including a slide bar, stops on said barand a stop engaging finger carried by said grinder tool carriage.

'4. In a grinding machine, a bed, a spindle stock on the bed, a chuckspindle mounted on the stock, means for turning said spindle;

a grinder tool carriage movable along the bed. toward and from theclutch, means for rotating the tool; mechanism for effecting themovements of the tool carriage, means for driving said mechanism fromsaid spindle, said driving means including a shitable clutch element,loose clutch pulleyscoperative'vvith said element. and rotatable inopposite directions, and a reversiingr gear connected with saidshiiitable clutch element, said reversing gear including a rock shaft,al Weighted arm on said rock shaft, a lever connected to said shiftableclutch element, a connection between said lever and said rock shaft,and'means for moving said rock shaft to convey said weighted leverbeyond the dead center.

5. In a grinding machine, a hed, a spindle stock on the bed, a chuckspindle mounted on the-stock, means for turning said spindle; a grindertool carriage movable along the bed toward and from the chuck, means forrotating the tool; mechanism for eii'ecting the movements of the toolcarriage.y means for driving said mechanism 'from said spindle,` saiddriving means including a slziil'able clutch element, loose clutchpulleys coperative with said element and rotataiile'in oppositedirections, and a reversing gear connected withv said shiitable clutchelement,

,spindle carriage or stock mounted on macerie said reversing gearincluding a slide bar, stops on said har and a stop engaging finger saidbar and said rock shaft for moving said rock shaft to convey saidWeighted lever beyond the dead center.

6. in a grinder, a bed on standard, a chuck standard, said stock .havinghearing jap rights, a spindle supported in said uprights, said spindlecomprising tapered bearing bushing receiving portions, bearing elisirings for the respective bearings bored to iit said tapered bushingreceiving portions, a driving pulley mounted on said spindie heltweensaid taperedvportions, said spindle lhaving a chuck receiving end, andmeans for adjusting the tapered portions of said spin dle with yrelationto the respective bearing bushings to take up wear` :i grinding toolcarriage mounted on said bed, a grinding tool rotatably mounted on saidtool carriage, means for rotating said toolfand means for feeding saidtool carriage toward or from the spindle carriage.

7. In a grinder, a bed and standard, a chuck spindle carriage or stockmounted on said standard, said stock having bearing uprights, a spindlesupported in said updii rights, said spindle comprising taperedhearingbushing receiving portions, bearing bushings for the respective bearingsbored to fit. said tapered hushing receiving portions, a driving` pulleymounted on said spindle between said tapered portions, said spindlehavingr a chuck receivingn end, means for adjusting the tapered portionsof said spindle with relation to the respective bearing bushings to takeup Wear; a grinding tool carriage mounted on said bed, a grind ing toolrotatably mounted on said tool carriage, means for rotating said tool,'neans` for feeding said tool carriage toward or from the spindlecarriage, said last named means comprising a screw supported by the bedand cooperatively connected 'with tool carriage, said spindle having aVrear-- wardly projecting end, driving pulleys on I' said standard, saidstock having bearing uprights, a spindle supported in said uprights,

said spindle comprising tapered bearing bushing receiving portions,bearing bushings for the respective bearings bored to lit seid. taperedbushing receiving portions, a driv ing pulley mounted on seid spindlebetween said tapered portions, said'spind-le having a chuck receivingend, means for adjusting the tapered portions of said spindle 'withrelation to the respective bearing bushings to take up Wear; a, grindingtooi carriage mounted on said bed, a. grinding' tool rotate,- blymounted on said tool cerriagenieens for rotating said tool, means forfeeding said tool carriage toward or from tlie spiredle carriage. seidlastA named means coinprising a screw supported bythe bed endcooperatively Vconnected with .seid tool can riage, seid spindle havingarearwardly projecting end, driving polleys on said projecting end, apower transmitting connection between said driving pulleysend said screwfor eiiecting the movements of said tool carriage, said. powertransmitting connections including e countershuiit, 1 pair .of clutchpulleys mounted on said counterslieft, power transmitting' connectionsbetween the respecltive clutch pulleys and said spindle for ei footingrrotation oi said clutch pulleys in opposite directions, esliitebleclutch element cooperating witlilsaid clutch pulleys,

`end means for actuating said shittable su clutch element.

9. ln a, ,erm-iler, a bed and standard, e

chuck spindle carriage or stools mounted on said standard, said stool;having bearing uprigh'ts, a spindle supported in said uprights, saidspindle comprising tapered bearing bushingreceii-'ing portions, 'bearingbushings for the respective bearings bored to'iit seid tapered bushingreceiving portions, a driving' pulley mounted on said spindle, betweensaid. tapered portions, seid spindle having` a chuck receiving end,means for adjusting the tapered portions oi? seid spin-` dle withrelution to therespective bearing bushings to taire up Wear; a grindingtool carriage mounted on said bed, a grinding tool rotatably mounted onsaid tool ca'iiriage,

ineens for rotating seid tool means for eedt* spindle carriage, saidlast named means comprising a screw supported by the bed andcooperativelyl connected with said tool carriage, said spindle having arearwardly projecting end, driving' pulleys on said projecting end. :ipower transmittingr connection between seid driving pulleys and saidscrew for eiilectinnj the movements of said 'ooi carriage, said powertransmitting connec'tions including s countersliaft, a pair of clilitelipulleys mounted on said countershni't, power transmitting connectionsbetween the respective clutch pullevs and said spindle for eiiectingrotation oi' said clutch pulleys in opposite directions, a shiftebleclutch element cooperating" with said clutch pnlleys, and a reverseL,gearmechanism conJ ing said tool carriave toward or from the trolledby the movements of the tool carriage for actuating said shiftableclutch elementto eiect a reciprocatory movement in the tool carriage.

10. Inga grinder, a bed and standard, a 7o chuck spindle carriage orstock mounted on said standard, seid stock having bearing up rights, aspindle supported in said uprights, said spindle .comprising taperedbearing bushing 'receiving portions, bearing busli-l 75 for therespective bearings borcd'to fit seid tapered bushing receivingportions, s driving pulley mounted on said'spindle betvveen said taperedportions, said spindle having e, chuck receiving end, means forid- 8o'.justing the tapered portions to taire up Wear,

s grinding tool carriage mounted on said bed, e grinding; tool rotatablymounted on said toni carriage, means for rotating said tool, means forfeeding said tool carriage to 85 Werd or from the spindle carriage, saidlast named means comprising a screw supported .by the bed andcoperatively connected with said tool carriage, seid spindle havingaiearwardly projecting end, driving pulleys on said projecting end,power transmitting connections betweenl said driving pulleysr and saidscre'vv for eiiecting the movements of said tool carriage, said powertransmitting connections including a countershaft, apair ofclutcli'pulleys mounted on seid countersliaft, power transmittingconnections between the respective clutch pulleys sind said yspindle foreffecting rotetionwoiisaid clutch pulleys in opposite directions, eshiftablc clutch element cooperating with seid clutch, pulleys', meansfor actuating seid shifta'bl clutch element, and means for arresting themovement of the said screw, said means including a manually operatedshift'able clutclrio v member in said first mentioned power transmittingconnection.

1l. ln a grinder, a bed and. standard, av chuck spindylecerriegc orstoclr mounted on said standard, said stock having bearing uprightsfaspindle supported in said uprights, said spindle comprising taperedbearn ing bushing receiving portions', 'bearing bushings for therespective bearings bored t 'to fit said tapered bushing receiving porsitions, e driving pulley mounted on said spindle,- between said taperedportions, said spindle having a chuck receiving end, means 'or'adjnstingthe tapered portions of said spindle with relation to therespective'lceai`- 120 ing' bushings to take up Wear, n grinding toolcerriuge mounted on said bed, a. grinding tool rotatably mounted on saidtool carriage means for rotating said tool, means for feeding saidtoolcarriage toward `or 125 from the spindle carriage, said last named imeans comprising a screw supported by the lbed and cooperatively'connected with said toolcarriage, said spindle having a rearvvardlyprojecting end, power transmitting connections between said drivingpulleys and said screw for etlectingof said tool carriage,

said power transmitting connectionsincludlngyacountershaft, a pair otclutcli'pulleys `mounted von saidl counter-shaft, power transbed, aspindle rotatably mounted in said car-l ringe, means for driving saidspindle, 'chuck carried byA said spindle, a grinding tool carriagelongitudinally movable on said bed toward and from said chuck,

vinding tool., a feedA screw for moving said ool carriage toward or fromsaid chuck, 'and a mechanism for driving said feed screw from saidspindle, said mechanism including power transmitting 'spindle and saidsrew, atively .connecting and disconnecting said power transmittingconnections.

13. in agriiider,a standard and bed, a spindle carriage adjustablymounted on said sed, a spindle rotatably mounted in said carriage, meansfor driving said' spindle, Ia chuclr carried by said spindle, toolcarriage longitudinally movable on said bed toward and from said chuck,a grinding connections between said tool adjustably and rotatablemounted lonsaid tool carriage, means for rotating said grinding tool, afeed sci-ew for moving said Itool carriage toward or from said chuck', amechanism 'for driving said teed screw from said spindle, said mechanismincludingT power transmitting connections between said'l spindle andsaid screw, means for operatively connecting .and disconnecting saidpower transmitting connections, and means for reversing the action ofsaid power transmitting connections on said screw. v

14. ln a grinder, standard and bed, a

spindle carriage adjustably mounted on said bed, a spindle rotatablymounted in said carriage, means for driving said spindle, a 'chuckcarried said spindle, a grinding tool carriage longitudinally movable onsaid bed toward and from said cliuck, a grinding tool adjust-ably and4rotatably mounted on said tool carriage, means for rotating saidgrindingtool, a feed screw for moving said tool carriage toward or fromsaid cliuck, a

I a grinding i' tool adjustably and rotatably mounted on saidtoolcarriage, means 'for rotating saidv and means for opera grindingnineties mechanism for driving said feed screw from said. spindle,saidmechanism including power transmitting connections between saidspindle 'and said screvnrineans Vfor operatively yconnecting anddisconnecting said power transmitting connections, means forreversingthe aotino said power transmitting connections on said screw, saidreversf ing means including. oppositely rotatable driving members, and asliitable clutch elemen-t coperating with tlie same, and means foractuating said. shiftable' clutch element.

15. ln a grinder, standard and bed, a `pindle carriage adjustablymounted on said bed, a spindle rotatably mounted in said carriage, meansfor driving 'said spindle, a

chuck carried by said spindle, a grinding tool carriage longitudinallymovable on said bed toward and from said chuck, a grinding tooladjustably and rotatably mounted on said tool carriage, means forrotating said grinding tool, a feed screw for moving said toolcarriagetoward and from said chuck, a mechanism for driving said feed screw'from said spindle, said mechanism including power transmittingconnections between said spindle and said screw, means for said powertransmitting connections, means operatively connecting and disconnectingj for reversing the action oi said power trans v mitting connections onsaid screw, said reversing means including oppositely rota-v tabledriving members, a shiftable clutch' element'coperating with the same,means for actuating said slnttable clutcli element, said last namedmeans comprising an auto-v matic reversinggear including slide bai" anda. linger on the tool carriage for actuating lsaid slide bar as saidtool carriage reaches the limits of its movement toward or trom saidchuck.

16., Ina grinding machine, a standard and bed, la spindle rotatablymounted on said bed, means for driving said spindle, a work holdercarried by said spindle, a grinding tool carriage movable along said bedtoward andi from said work holder, a rotatable grinding tool mounted onsaid tool carriage, and means for driving' said grinding tool, a feedscrew carried by the bed and connected with said tool carriage, a shafttransversely vmouifited in said standard, gearycoir nections betweensaid screw and said shaft, av worm gear loosely mounted on said shaft, asliiftable clutcli element for connecting said worm gear with saidshaft, ay manually 'operated member for shitting said sliiftable clutchelement into and out of engagement, a worin shaft mounted on saidstandard and .having a worm in engagement with said worin gear, looseclutch pulleys mounted on tions between seid driving pulleys and seidclutch pulleys to eleet rotation of said clutch pulleys in oppositedirections, and Ineens for shifting Said shifable clutch element.

l17. In :i grinding machine, a sancloifl and bed, a spindle rotatablymounted on sold bed, means for driving said spindle, o Work holdercarried by seid spindle, e grinding tool carriage movlile along seidheil t Word and 'from said work holden, a ifosetable grinding toolmounted on saisi tool carriage and ineens for diiving seid grindingtool, e feed. Screw cairied by Ehe bed end connected with seid tool.carriage,

a shaft transverse y 'mounted in seid stendard, gear connectionsloemveen 'seizl sei-ew and said shaft, a worin geer'loosely mounted onsaid shaft, a shifteble clutch eleinenI for connecti'n, said Worm geeln/'i-,li'seifl shaft,

a manual y operated member for shifting Seit sliifalole elueh eleineniinto and out of engegemenne Worm she mounted on Said standard and havingafi/vorm in engage- Zii-nnenl; with soifl Worm geen, loose Clutchpulleys mounecl on said Worm shaft, o shift able clutch elemenif'eeriiedby seid einem shale to cooperate with said clutch pulleys, drivingpulleys mounted on said spindle,

3o hell; connections between seid clriving pnl le eend Said elnchpulleys zo ell'eo: roseion o said clutch pulleys in opposite diiecions,a lever connected with said' shiteble clutch element, e stub shaft, acrank on seil stub shaft, a. link bar connecting said eienk with f seidlever, and e hand operated lei/ei1 on seid stub shaft for tunning theseine.

`18. ln e, grinding; moohine, as senlerii ,f and bed, a. spindleifoeehly mo'une. on 40 said bed, mesns foi" driving said enindle, a Workholder' oezriecl by eii 'spinello grinding tool Carriage movable alongseifl 4bed toward enel fiom seicll Werl; holden, e xi'omtable giindingtool mounecl on said tool 45 vcarriage and means for alriving seidgrin@- ing tool, e feed screw eam'ied by the bed ,und connected withseid tool eerioge, e shaft trs'nsverseljy.mounted in sind sendeiil, gearconnections between said screw and said shaft, o worm geen loosely inonnlefl on seid shaft, a, shiftable clutch element foi7 conmeeting saidWorin geen Wih said sha, e 'manually operated member for sniffing saidsliiftable clutch element into and out of engagement, a Worin shaftmounted on. said standard and having e worm in engagement with said Wormgeen, loose clutch pulleys mounted on said worm shaft, a shiftahleclutch' element carried by seid Worm shaft to'coperatewith said clutchpulleys, drivin;Y pulleys in'onntecl on seid spindle, belt Connectionsbetween said driving pulleys and seid clutch pulleys to ellect rotationof said clutch pulleys in opposite dlreciions, :i 55 lever connectedwith suifl shiltzible clutch element, stub shaft, a crank on seid ez'nisliof., e link han.' connecting said einnl: 'n ith seid lever, a handoperaeel leve:v on, seid smb shef for tui-ning the seine, n slide lm,adjustable stops czni'ied by said slide hun fi finger Carried by sindIool marriage. lo "w operaie with said stops and notant@ nifl slide bei'and :a power trensniitlng eonnwion ljeween said slide haz' and Said szi;shef foi' convoi-line` tliei-eciproeating mos tion of saixl slide lim'into rotary inmion in said sub slmf'e to the shifting of 'willshii'tnble clutch eleinen.,

lf). ln' n grinding machine, n s'lniifleitcl an@ heil, e spindlerotatably mounted on said bed, ineens foi' driving seifl spindle, :iwork holder carriedr by', said spindle, o grinding tool carriagemovablealong: snlil bed owercl and fiom said woi'l; holder.y :i i'oteohlegrinding tool inonne on seid tool carriage and Ineens for driving; seidgrind-- ing Sool, a feed seven' carried oy the lie/l :i el "conneced ihsaid lool een-loge, n slizis; 1 ransversely inounecl in seid elondo-Ml.,veel' oonneeions he'ln'een said eenen* enel sani shaft, a 'wenn geenloose shaft, a shift-able cinto neet-ing;r seid worm gear 'nn manuallyoperate@ niemeer foi* shir'l shiable clue/li elen gagemen; a nfoini si.senileril and having e Woi'm wih said worin geen, loose olnes. pulley*mounecl on said Worin shaft, a shitnhle clutch element eei'rienl by seidworm she-lt fo copeme with seid elneli pnlleye, (hiv ine; pulleysPaolini-eil on seid siiinclle, hell, eonnecions oeween driving pnileyseno soif?. oluieli pulleys lo el'eo; retail-ion olj said eluieh pulleyin r )noel-'ie iliieeifif zi levezJ oonneeiefl i gl ,J I f element, o.stub sli;A Si Mii, flink hei iingei' Corrieri seid tool esi operaie withseicl sogis und slicle hay and e power tiensniitlingi' wonnen4tion`l,\e,ffeen said slirle oer and snif sluit i shaft for convertingelle ieoinfoeetineinoion oi' said slide bei into rotary moi .i in saidstub shaft eo ell'eiit ihe .shifting o; is! shiftzible clutch element,enel means on stub shaft for throwing over the seme e said slide bin'has turned seid sinh sha predetermined distance in either diie, n lsoeect n quick shifaingf action on sani shii'r'table clutch member. f

20. ln a grinding.machine, a heil, e, alle siecle: on the loecl, e Chuckspindle moi ii ed on the stock, and means for einine l spindle; agrinder tool enri'iage inoi'elile alongf the be@ toward and from liechunk. means for rotating the tool; xneehaniem i.

and removing;r the dust and grindings from l ihe machine. n i Q1. Incombination the work holder ,bia

grinding machine, of a dust collector edmprisinga receptacle adapted toit around the work, anejector into which the recap taeie delivers, adischarge vduct from the eieetor and a motive Huid transmitting'ductdelivering into the ejeetoi'.

in a machine of the character stated, a support having a pair ofbearings pro Tvided with oil collecting and retaining Chambers, eneofsaid bearings having' a taperingy bearing surface, a shaft mounted insaidrbearings, a taper sleeve on said shaft to fit said taper bearingrsurface, and means for adjusting said sleeve to take up Weaig'a drivingpulley see'red to said shaft between said bearings, and means foradmitting 1u`v bricant into said bearing ehammbers,

shaft having .an outer projecting end and agrinding disk secured to''said end.

23. n a machine of the character stated,

a support having a pair of bearings prol justine" said sleeve to takeup`wear, a driving' pulley secured to said shaft between said bearings,means for admitting lubricant into said bearingr chambers, said Shafthaving an o'liter projecting end and a grinding disk secured te' saidend, bali bearing eie-` ments within said bearing Chambers; forsupporting said shaft.

nimm omini STEPHENSUN. ALFRED l'. DBPLIK.

VVitness:

RICHARD SPEIGTE- BUNN, C. BLANKENSHIP.

` it said taper bearing surface, means for ad-

